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        <tr><th colspan="3">商城</th></tr>
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        <tr><td>京东</td><td>苹果</td><td>4999</td></tr>
        <tr class="gap"></tr>
        <tr><td>淘宝</td><td>oppo</td><td>2899</td></tr>
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        <tr><td>苏宁</td><td>华为</td><td>1999</td></tr>
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